ANALYSIS OF ELECTRICAL EQUIPMENT OPERATING MODES OF THE EXCAVATION SITE OF A MODERN COAL MINE
The growth in the power supply and the development of a mechanized complex of mining districts in coal mines has an impact on the characteristics of their power consumption. The improvement of coal mining technologies affects the servicing factor of mining machines, and the introduction of a modern variable-frequencyelectric drive can affect the dynamics of changes in electrical loads. Cited in the literature, the characteristics of the electrical load of the excavation districts of coal mines were obtained in the XX century and are outdated. To make adequate technical solutions in the design and management of power supply systems for coal mines, it is necessary to update these characteristics. Implementation of the SCADA system in coal mines makes it possible to obtain a large amount of measurement information that can be processed using modern methods of working with big data. The purpose of this work is a comparative analysis of the statistical characteristics of the electrical load of the modern Eickhoff SL 900 shearer with similar characteristics of the shearers used in the 1980s. The measurement data is collected using the SCADA system of a coal mine and includes measurements of the current, the shearer speed and the conveyor traffic flow. The measurement period covers 72 days. After the initial processing of the measurements, data arrays were formed with a time interval of 5 seconds. As a result of statistical processing of the arrays of measurements, the following characteristics of the shearer were determined: cycle time; work time; downtime; cyclic duration factor (CDF); time utilization degree (ηТ); coefficient of variation (CV). Comparative analysis of the listed characteristics showed that the SL 900 shearer has a significantly longer duration of operation and the time utilization degreein comparison with shearers of the 1960-1970s. Correlation analysis of the electrical load of the shearer with the shearer speed and the conveyor traffic flow showed a weak relationship, from which it was concluded that the dynamics of the change in the longwall shearer electrical load is mainly determined by the presence of solid inclusions in the destroyed coal mass.
